Happy Mother's Day!!

Assuming this ratio hasn't shifted much over the past 8 years, around 28% of the total U.S. population are mothers,

Of course, women over 64 (mostly on Medicare) are much more likely than the general population to be mothers...but girls under 18 are far less likely to be (well...under 16, anyway...the birth rate varies from state to state, of course), so I'm assuming that these cancel each other out, resulting in that 28% rate being roughly accurate.

In addition, according to the Center for American Progress, roughly 85.6 million Americans between the ages of 18-64 have pre-existing conditions. With both seniors and children removed from the total, and assuming that same ~28% figure, that means roughly 24 million non-elderly mothers have pre-existing conditions, of which roughly 3.8 million are currently on the individual market.

Obviously these are very rough, back-of-the-envelope estimates; to be safe, let's err on the lower side and call it 6 million mothers losing coverage and 22 million w/pre-existing conditions, of which, say, 3.5 million are on the individual market. That's much better.